Method for measuring the absolute light throughput of reflective-mode displays in an optical system

摘要

A method for measuring the absolute throughput of a polarization modulating reflective display in an optical system having a folded light path. The steps include measuring a first light intensity, L_R, in the folded light path, having a first polarizing beam splitter, and a reflective display. A second intensity, L_O, is measured using an unfolded light path where the reflective display is replaced by a second cross-rotated polarizing beam splitter. The absolute throughput is T_M is calculated, where T_M=L_R/L_O.